CNC cassette

• accepts two lengths of boxes (200 mm and 380 mm, width always 200 mm)
• has height adjustment (sinking by 50 mm)
• provides positioning in XY and Z
• presses only from the sides (ends) – without top clamping
• allows milling from both the face and the edge
• enables leveling of the lid even if the hinges/screws "pull" it sideways
• made of MDF or plywood, and the clamps are metal, + soft padding (to avoid scratching the box)

Below I provide

a structured technical specification

Technical specification: universal milling cassette for boxes

1. Dimensions / types of workpieces

Both boxes have a protruding lid,

which sinks by 50 mm when installed in the cassette

(i.e., 10 mm remains on the surface of the cassette — this is the area of the lid that will be milled).

2. Clamping / fixation

• Clamping only from the ends (sides), without top clamping
• Uses eccentric clamps integrated into the cassette body
• Clamping zone — at a height of 35–45 mm (i.e., in the lid area)
• For 200 mm and 380 mm lengths, the same eccentrics are used, positioned in a universal position inside the long side
• Clamping from the other long side is a fixture (parallel side)

The long box (380 mm) is clamped:

at two points along Y + one point along X (end)

The short box (200 mm) is clamped at the same points (eccentrics + end stop)

3. Positioning in Z

• The box is lowered into the cassette by 50 mm
• The lower level of the cassette serves as a reference plane
• In the cassette, provide points for placing foil/paper (0.1–0.4 mm) → for correcting the plane if the lid is not parallel due to the hinge/screw
• If desired, screw micro-lifters or pockets for pads can be implemented in the 4 corners of the cassette

4. Materials

5. Additional groove for edge milling:

• in the 4th (end) side of the cassette, create a separate groove
  → allows the box to be placed on the end to raise Z to full height (~200 mm) and mill along the edge
• In this mode, the clamps must also work from the side, so the eccentrics must be positioned higher.

6. What is expected from the performer

3D model of the cassette with all clamps

Placement of eccentrics for two lengths (200 / 380)

Overall and installation dimensions

Micro-adjustment unit for Z (or pockets for pads)